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24 Cards in this Set
- Front
- Back
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What is the work-energy theorem?
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The relationship between work and energy stating that the work done is equal to the change in energy.
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What is positive work?
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The work done by a system when the torque exerted by a muscle is greater that the torque of the external load.
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What is negative work?
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The work done on a system when the loading is greater that the torque exerted by the muscle.
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What is stability?
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Resistance to a disturbance in the body's equilibrium.
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What is statics?
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The branch of mechanics in which the system being studied undergoes no acceleration.
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What is dynamics?
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The branch of mechanics in which the system being studied undergoes acceleration.
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What is a lever?
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A mechanism for doing work that consists of a fulcrum and two eccentric forces.
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How many kinds of levers are there? Name them?
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There are 3 kinds of lever systems. There are 1st (ex. C1,C2 vertebrae), 2nd (ex. brachioradialis, like a wheelbarrel), and 3rd (ex. elbow joint) class levers.
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What is a fulcrum?
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The axis of rotation of a lever.
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What is the most common lever found in the human body?
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3rd class muscles (ex. elbow joint)
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What lever systems have an advantage/disadvantage when it comes to force?
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Advantage - 2nd Class
Disadvantage - 3rd Class |
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What is range of motion (ROM)?
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The distance (linear or angular) that a movable object may normally travel while properly attached to another object.
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What is an eccentric force?
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A force that is not applied through the center of mass of an object.
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What is the center of mass?
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A balance point of a body; the point about which all of the mass particles of the body are evenly distributed.
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What is center of gravity?
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The point at which all of the body's mass seems to be concentrated; the balance point of the body; the point about which the sum of the torques equals zero.
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What is external work?
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The work done by the body on another body.
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What is internal work?
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The total work done resulting from the motion of all of the body's segments.
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What is angular momentum?
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The quantity of angular motion determined by the product of the object's angular velocity and its moment of inertia.
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What is angular power?
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The time rate of change of angular work determined by the product of the torque and the angular velocity.
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What is angular work?
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The product of torque applied to an object and the angular distance over which the torque is applied.
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What lever class has an advantage/disadvantage when it comes to range of motion (ROM)?
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Advantage - 3rd class
Disadvantage - 1st and 2nd class |
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What is a centripital force?
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A force that makes a body follow a curved path. (ex. an olympic hammer thrower)
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What is a centrifugal force?
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The effects of inertia that arise in connection with rotation and which are experienced as an outward force away from the center of rotation.
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What is an EMG?
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Electromyography, a technique for evaluating and recording the activation signal of muscles
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